Cytogenetic and histological studies of the brook trout, Salvelinus fontinalis (Mitchill), and the Arctic char, S-alpinus (L.) hybrids
Although brook trout and the Arctic char hybrids are able to reproduce, individuals with decreased fertility or even fish that are unable to produce any gametes have been also described. Abnormal gonadal development and disturbances in the gamete production in the char hybrid offspring may be trigge...
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ftunivalgarve:oai:sapientia.ualg.pt:10400.1/11283 2023-05-15T14:52:03+02:00 Cytogenetic and histological studies of the brook trout, Salvelinus fontinalis (Mitchill), and the Arctic char, S-alpinus (L.) hybrids Ocalewicz, Konrad Hliwa, Piotr Pomianowski, Konrad Lisboa, Rodrigo Jankun, Malgorzata 2014-02 http://hdl.handle.net/10400.1/11283 https://doi.org/10.1007/s10499-013-9655-4 eng eng Springer 0967-6120 1573-143X http://hdl.handle.net/10400.1/11283 doi:10.1007/s10499-013-9655-4 openAccess http://creativecommons.org/licenses/by/4.0/ CC-BY Telomeric sequences Salmon Hybridization Pisces Fish Chromosomes Gonads Intersex Reproduction Sex differentiation article 2014 ftunivalgarve https://doi.org/10.1007/s10499-013-9655-4 2022-05-30T08:48:15Z Although brook trout and the Arctic char hybrids are able to reproduce, individuals with decreased fertility or even fish that are unable to produce any gametes have been also described. Abnormal gonadal development and disturbances in the gamete production in the char hybrid offspring may be triggered by the odd chromosome number and disturbances in their pairing during meiosis. To verify this hypothesis, cytogenetic examination and the gonadal histology analysis of the brook trout x Arctic char hybrids were carried out. Diploid chromosome number in the studied char (F-1) hybrids varied from 82 to 84 (FN = 99-102). Among 28 hybrids, 12 males, three females, nine intersex individuals and two sterile specimens were described. In the case of two individuals, gonads were not found. Diploid chromosome numbers in the males and intersex individuals varied from 82 to 84. Chromosome numbers in the females were 82 and 83 chromosomes. Two sterile fish exhibited karyotypes composed of 82 and 84 chromosomes. Predominance of the ovarian component in the intersex gonads and gonadal sex ratio distortion towards the males suggested hybrid females had problems with gonadal differentiation. However, the lack of the clear relationship between chromosome number and gonadal development in the studied hybrids did not support our hypothesis that odd chromosome number may be responsible for such reproductive disturbances in the hybrid individuals. We have presumed that sterility and intersexual development of the gonads may be caused by interactions between brook trout and Arctic char genes on the sex chromosomes and autosomes rather than unpairing of the parental chromosomes. Polish National Science Center (NCN) [N N311 525240] info:eu-repo/semantics/publishedVersion Article in Journal/Newspaper Arctic Universidade do Algarve: Sapienta Arctic Aquaculture International 22 1 281 288 |
institution |
Open Polar |
collection |
Universidade do Algarve: Sapienta |
op_collection_id |
ftunivalgarve |
language |
English |
topic |
Telomeric sequences Salmon Hybridization Pisces Fish Chromosomes Gonads Intersex Reproduction Sex differentiation |
spellingShingle |
Telomeric sequences Salmon Hybridization Pisces Fish Chromosomes Gonads Intersex Reproduction Sex differentiation Ocalewicz, Konrad Hliwa, Piotr Pomianowski, Konrad Lisboa, Rodrigo Jankun, Malgorzata Cytogenetic and histological studies of the brook trout, Salvelinus fontinalis (Mitchill), and the Arctic char, S-alpinus (L.) hybrids |
topic_facet |
Telomeric sequences Salmon Hybridization Pisces Fish Chromosomes Gonads Intersex Reproduction Sex differentiation |
description |
Although brook trout and the Arctic char hybrids are able to reproduce, individuals with decreased fertility or even fish that are unable to produce any gametes have been also described. Abnormal gonadal development and disturbances in the gamete production in the char hybrid offspring may be triggered by the odd chromosome number and disturbances in their pairing during meiosis. To verify this hypothesis, cytogenetic examination and the gonadal histology analysis of the brook trout x Arctic char hybrids were carried out. Diploid chromosome number in the studied char (F-1) hybrids varied from 82 to 84 (FN = 99-102). Among 28 hybrids, 12 males, three females, nine intersex individuals and two sterile specimens were described. In the case of two individuals, gonads were not found. Diploid chromosome numbers in the males and intersex individuals varied from 82 to 84. Chromosome numbers in the females were 82 and 83 chromosomes. Two sterile fish exhibited karyotypes composed of 82 and 84 chromosomes. Predominance of the ovarian component in the intersex gonads and gonadal sex ratio distortion towards the males suggested hybrid females had problems with gonadal differentiation. However, the lack of the clear relationship between chromosome number and gonadal development in the studied hybrids did not support our hypothesis that odd chromosome number may be responsible for such reproductive disturbances in the hybrid individuals. We have presumed that sterility and intersexual development of the gonads may be caused by interactions between brook trout and Arctic char genes on the sex chromosomes and autosomes rather than unpairing of the parental chromosomes. Polish National Science Center (NCN) [N N311 525240] info:eu-repo/semantics/publishedVersion |
format |
Article in Journal/Newspaper |
author |
Ocalewicz, Konrad Hliwa, Piotr Pomianowski, Konrad Lisboa, Rodrigo Jankun, Malgorzata |
author_facet |
Ocalewicz, Konrad Hliwa, Piotr Pomianowski, Konrad Lisboa, Rodrigo Jankun, Malgorzata |
author_sort |
Ocalewicz, Konrad |
title |
Cytogenetic and histological studies of the brook trout, Salvelinus fontinalis (Mitchill), and the Arctic char, S-alpinus (L.) hybrids |
title_short |
Cytogenetic and histological studies of the brook trout, Salvelinus fontinalis (Mitchill), and the Arctic char, S-alpinus (L.) hybrids |
title_full |
Cytogenetic and histological studies of the brook trout, Salvelinus fontinalis (Mitchill), and the Arctic char, S-alpinus (L.) hybrids |
title_fullStr |
Cytogenetic and histological studies of the brook trout, Salvelinus fontinalis (Mitchill), and the Arctic char, S-alpinus (L.) hybrids |
title_full_unstemmed |
Cytogenetic and histological studies of the brook trout, Salvelinus fontinalis (Mitchill), and the Arctic char, S-alpinus (L.) hybrids |
title_sort |
cytogenetic and histological studies of the brook trout, salvelinus fontinalis (mitchill), and the arctic char, s-alpinus (l.) hybrids |
publisher |
Springer |
publishDate |
2014 |
url |
http://hdl.handle.net/10400.1/11283 https://doi.org/10.1007/s10499-013-9655-4 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_relation |
0967-6120 1573-143X http://hdl.handle.net/10400.1/11283 doi:10.1007/s10499-013-9655-4 |
op_rights |
openAccess http://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1007/s10499-013-9655-4 |
container_title |
Aquaculture International |
container_volume |
22 |
container_issue |
1 |
container_start_page |
281 |
op_container_end_page |
288 |
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1766323175590723584 |